Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6ec86a92fe7be2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 02:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93e786a67a3e8a89bd08fa1e735a9fa4 SHA-1: 75b14886d1c60d1b764f0d2178fd5e195667c16f SHA-256: cc6ec86a92fe7be2aa69b0e14282d474ab914914e3df82f8d02c5932c4aca4ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=galaxy+s8+edge+screen+size PDF link annotation
    • https://petrovsky14.ru/docs/files/19961688472.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/84206523491.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/pujarenud.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/45143713892.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/97535483096.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161433e0517e1c---9504142729.pdfIn PDF document text
    • http://belniig.by/public/file/vomexanawi.pdfIn PDF document text
    • https://chp-travel.ir/data/file/1705093076.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/verevowegemeninogerike.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/95699167749.pdfIn PDF document text
    • https://aromamarketing.md/img/files/jitarakajaradekugawar.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/33003169506.pdfIn PDF document text
    • http://coachhouse.info/assets/file/31421544336.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/tebazexalunexitozuba.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/37897531757.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/rakuxu.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/24710036240.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/28631378720.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/sikudazuxizadotazited.pdfIn PDF document text
    • https://coluer.ir/documents/file/59983484563.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/9269691816.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/25cdd69224d1dbe4a61a442b38c8eceb/58468946329.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/56103503326.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/mefejofu.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/28473791202.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/zozopegumelonirimevuli.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 17716 bytes
SHA-256: 1a89eb06ae87c9a20274ab3b95f0369cba7f805683b679b06bc61fec10ca2164
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 10848 bytes
SHA-256: 3a45825ac8d061739d024096fe9bac6463e7e87bb3c25d076e76b42f351a068a